| Locality | Postal Code |
|---|---|
| Alicia, San Justo | X5949 |
| Altos de Chipión, San Justo | X2417 |
| Arbol Chato, San Justo | X2432 XAE |
| Arroyito, San Justo | X2434 |
| Arroyo de Álvarez, San Justo | X2434 XAB |
| Balnearia, San Justo | X5141 |
| Barrio Muller, San Justo | X5143 XAC |
| Brinkmann, San Justo | X2419 |
| Campo Bandillo, San Justo | X5943 XAA |
| Campo Beiro, San Justo | X2421 XAG |
| Campo Boero, San Justo | X2426 XAB |
| Campo Calvo, San Justo | X2423 XAE |
| Campo Coyunda, San Justo | X5139 XAG |
| Campo La Luisa, San Justo | X2423 XAD |
| Capilla San Antonio, San Justo | X2432 XAD |
| Capilla Santa Rosa, San Justo | X2415 XAB |
| Colonia 10 de Julio, San Justo | X2349 XAD |
| Colonia Angelita, San Justo | X5941 XAA |
| Colonia Anita, San Justo | X2413 XAD |
| Colonia Arroyo de Alvarez, San Justo | X2436 XAC |
| Colonia Beiró, San Justo | X2421 XAE |
| Colonia Botturi, San Justo | X2419 XAB |
| Colonia Ceferina, San Justo | X2415 XAC |
| Colonia Cortadera, San Justo | X2436 XAA |
| Colonia Coyunda, San Justo | X2435 XAB |
| Colonia Cristina, San Justo | X2424 XAB |